Tiller Lock BoxThis inexpensive product turns any boat with a ball-grip Forespar tiller extension into a boat with a simple, effective and adjustable tiller lock. Install one into your cockpit coaming and you have it in minutes. Cut-out dimensions: 3-3/8"w X 4-3/4"h X 1-1/2"d. - cis2:mm5mnJlm -Specifications: Type: Tiller; Box Dimensions: 2"H x 5"W x 8"L WT: 0.2 lbs; UPC: 028026113429;