Cross-Bolts – 1/4-28 – Weaver – Package of two (2) bolts. Original factory replacement components for the entire line of TSR “W” & HRT style of scope rings. SPECS: 4140 Alloy Steel, black oxide finish to Mil-C-13924 standards. .140″ (3.56mm) cross-slot wide. 1/4″ (6.35mm) diameter. Designed specifically for (Weaver-Style) mounts.