Cross-Bolts – 1/4-28 – Weaver – Super Low – Package of two (2) bolts. Original factory replacement components for the entire line of TSR Super-Low scope rings. SPECS: 4140 Alloy Steel, black oxide finish to Mil-C-13924 standards. .140″ (3.55mm) cross-slot wide. 1/4″ (6.35mm) diameter. Designed specifically for Weaver-style (Weaver) mounts.