The Stem mount provides a computer position above the stem and out of harm’s way. This mount replaces a 5mm spacer below the top cap and fits 1-1/8” steerer tubes. Fixed position - Recommended for zero degree stem angles. Specifications Recommended for 0 Degree to Negative Degree Stem Angles 1-1/8" Steerer tube Diameter, Thickness (@ Steerer) - 5mm, Length (Center-to-Center) - 50mm, CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface Lifetime Guarantee against material or manufacture defects - damage due to abuse or crashing excluded Weight: Garmin 21 g, Wahoo 21gDimensions: 11 × 20 × 4 cm Compatibility Supported Computers – Garmin Edge 20, 25, 200, 500, 510, 520, 800, 810, 820 and Forerunner 310XT Wahoo- ELEMNT, Wahoo Roam, Wahoo Bolt, Wahoo MINIEDGE 1030, 1000 require > 70 mm and