Cycle Group BX-ST14H1N40-BK Box Hollow BMX Stem Available in anodized Red, Blue, Gold and Black with laser-etched graphics and five Hollow Chromoly Allen bolts Meets or exceeds enbmx category 2 standards Fits 22.2 o handlebars Not compatible with Carbon fiber steered tube forks Mini Hollow stems have a single-bolt wedge clamp, meaning there is no rear-facing Pinch bolts to injure the rider's knees