Tie Down Adjustable Roller Boat Guide-OnsTie Down Adjustable Roller Guide-Ons center the boat and trailer the safe and easy way. This roller guide provides up to 16" of adjustment (8" on each side) to fit the specific angle of your hull. Guide-ons includes hot dip galvanized steel components with a one-piece adjustable clamp and U-bolt. Designed to fit all channel and tube frames up to 5".Features: 16" of adjustment (8' on each side); Fits all channel and tube frames up to 5"; Hot dipped galvanized steel construction; Sold in pairs; Click to Download Tie Down Adjustable Roller Boat Guide-Ons Installation Instructions