Precision Threading: #6-48 x 1/4" Thread ensures a secure fit for Ruger 10/22 Picatinny Rails. Heat Treated Countersunk Torx Screws offer long-lasting performance. 12.9 Grade steel black oxide screws to retain your scope mounts on the rifles receiver. T10 Torx Security Bit prevents unauthorized tampering with firearms. 10 pcs screws and 2 pcs Allen wrenches in the bag. 10 Pcs #6-48 x 1/4" Countersunk Torx T10 Gunsmith Screws Optics Accessories for Attaching Scope Mounts to Receiver, 12.9 grade steel Black Oxide Finish