Check the listing for details. K-EDGE Hammerhead Boost Stem Mount - Adjustable, Black Anodize. Condition: New. Listed at 52.99 USD. The K-Edge Boost Mount is an ideal fit for short stems with steep upward stem angles. The 1cm rise in the base will allow the Hammerhead Karoo 2 to nest securely above the stem without interference. Easily attach this mount by replacing your 0.5mm spacer below your top cap.The Boost Stem Mount is specifically designed to fit atop the shortest stems on the market today. Keep your computer safe and secure above your stem in the roughest of terrain . Hammerhead approved replaceable computer insert protects computer interference. Compatibility: 1-1/8" steerer tube diameter, thickness 5mm, length (center-to-center) 50mm. Works with most steer tube tool kits. Weight: 25g. Made in Boise, ID USA. Lifetime guarantee against material or manufacture defects. Damages due to abuse or crashing HAVE A QUESTION?Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! Contact Us! (9-5 Mon-Fri, 12-4 Sat & Sun EST) Chat With Us