this listing is for a single stud, but of your choice. single QD sling swivel or bipod studs for wood or plastic stocks on rifles or shotguns, so you can fit QD sling swivels or fit Harris type bipods. Thread Shaft Length: 1) 1/2" (normally fits front forend) 2) 3/4" (noramlly fits rear butt) 3) 7/8" machine thread with nut 4) If its a mix let me know in the delivery instruction box or email. * White nylon washers included. Select which one/s you want and as many as you want.