Exterior Finish:Unfinished Wheel Size:20 Inches Material:Steel Pitch Circle Diameter:1 Inches Rim Size:1 Inches Item Weight:2 Pounds Item Diameter:20 Inches Vehicle Service Type:Bicycle Load Index:1 Rim Width:1 Inches Model:Training Wheels Item Weight:2 pounds Construction:Cast Speed Rating:1 Bolt Pattern (Number of Holes):1 Offset:1 Inches Children's Bicycle Training Wheels are made of high-quality steel which can bear heavy children without security problems. About this item Universal Diameter and Available Size training wheels with bracket attached with 5 various holes can excellently meet your needs to mount it on single-speed bikes from 12-20 inches with horizontal rearward-facing track fork end, but not suitable for those with semi-horizontal or vertical dropouts. (Tips: A few bicycle axles less than 0.8 inches will not fit) Thicker Bracket, Stronger and More DurableWe designed a heavy duty training wheel with bracket at 3mm thickness that is 20% thicker than regular one, high-quality steel frame, provide the necessary security and stability which it needs in the first road tests on the bike, Support riders weighing no more than 100 pounds. Double Bearing and Larger WasherAfter optimization, the double high carbon steel bearing of our training wheel has been tested to be silent and smooth, with longer wheel life. In addition, we have specially enlarged the washer so that it can cover the whole bearing nicely. Please do not worry about the sudden drop of the bearing. Security and StabilityThese bicycle training wheels are made of high quality plastic and PU which it is anti-slip, wear resistant, providing stability ,The oversized wheels have a diameter of 4.7 inches and a width of 1.9inches making them the widest on the market and ensuring great support. Wheels Light UpThe light will light up in the dark. Children definitely love the lights that can give them a beautiful world of children. Easy to install we offer complete installation tools. you have more options to adjust the height, so it's easy for you to install the training wheel on your bike quickly. Packing list Comprises two nuts, two washers, two shoulder bolts, two vertical bracket arms, two wheels, two wrenches ,1 installation manual ServiceThis extra wheels work on most 20 inch bicycles; However, the wheels might not work with some mountain or BMX bikes based on geometry of frame or complex design. We encourage you to reach out so we guide you in the installation process or refund the item if it is not for you. See more product details Universal Diameter and Available Size training wheels with bracket attached with 5 various holes can excellently meet your needs to mount it on single-speed bikes from 12-20 inches with horizontal rearward-facing track fork end, but not suitable for those with semi-horizontal or vertical dropouts. (Tips: A few bicycle axles less than 0.8 inches will not fit) Thicker Bracket, Stronger and More DurableWe designed a heavy duty training wheel with bracket at 3mm thickness that is 20% thicker than regular one, high-quality steel frame, provide the necessary security and stability which it needs in the first road tests on the bike, Support riders weighing no more than 100 pounds. Double Bearing and Larger WasherAfter optimization, the double high carbon steel bearing of our training wheel has been tested to be silent and smooth, with longer wheel life. In addition, we have specially enlarged the washer so that it can cover the whole bearing nicely. Please do not worry about the sudden drop of the bearing. Security and StabilityThese bicycle training wheels are made of high quality plastic and PU which it is anti-slip, wear resistant, providing stability ,The oversized wheels have a diameter of 4.7 inches and a width of 1.9inches making them the widest on the market and ensuring great support. Wheels Light UpThe light will light up in the dark. Children definitely love the lights that can give them a beautiful world of children. Easy to install we offer complete installation tools. you have more options to adjust the height, so it's easy for you to install the training wheel on your bike quickly. Packing list Comprises two nuts, two washers, two shoulder bolts, two vertical bracket arms, two wheels, two wrenches ,1 installation manual ServiceThis extra wheels work on most 20 inch bicycles; However, the wheels might not work with some mountain or BMX bikes based on geometry of frame or complex design. We encourage you to reach out so we guide you in the installation process or refund the item if it is not for you.