Grovtec US Inc GTSW07 Swivel Set Locking with Machine Screw 7/8"MacScrew; 1/2" & 3/4" WdScrewBase,3Spacers Black Steel $12.73
Grovtec US Inc GTSW27 Ruger Single Shot/Semi-Auto Swivels with Hardware 1" Ruger Carbines/Auto/Single Shot Black Steel $16.24