GrovTec US Ruger Carbine Auto&Single Locking Swivel Set Black. 44 Mag. and No. 3 carbines and 1/2" wood screw suitable for fore end stock mounting. Also includes 3/4" wood screw swivel stud rear and one pair GT Locking Swivels. Specifications for GrovTec US Ruger Carbine Auto&Single Locking Swivel Set: Manufacturer: GrovTec US Fabric/Material: Steel Gun Type: Rifle Gun Model: Ruger 10/22 Size: 1 in Features of GrovTec US Ruger Carbine Auto&Single Locking Swivel Set Includes both a fore end adaptor to fit 10/22 .44 Mag. and No. 3 carbines a 1/2in wood screw suitable for fore end stock mounting and a 3/4in wood screw swivel stud. Package Contents: GrovTec US Ruger Carbine Auto&Single Locking Swivel Set GrovTec US GTSW27: Ruger Carbine Auto&Single Locking Swivel Set Black