We provide two different length of the shutter trigger extension lever, compatible with the shutter trigger unit assembled on the DIVEVERYDAY handle bar kit. 33mm - fits the distance for original GoPro protective housing. 28mm - fits the distance for original Insta360 Ace Pro 1&2 dive case, and DJI OSMO Action series waterproof case. It is made of aluminum alloy to maintain light weight and high strength, hard anodized surface treatment makes it more scratch-resistant. Package includes a center M4 SS screw for installation.