Steel Screw-in Boat Cover Canvas 3/8" Dot Fasteners Snap Set Cap /Socket/ Stud (Cap Socket Stud 100 Pcs) Dimensions: Cap OD: 0.58" Socket OD: 0.53" Stud OD: 3/8" Screw length from bottom of stud: 3/8". Made of steel Corrosion-resistant bright nickel finish. we sell caps, sockets and studs , but we also sell them seperately. check the vibrations below.