Set Screw, Stainless Steel 5/16″-18 x 3/8″ Quantity 100 PieceFeatures and Benifits:Knurled cup points have an externally knurled cup that locks the set screw in place,It resists loosening and deformation under high vibration.Hex socket drive types have a hex-shaped recess in the head and are driven with hex keys or hex socket bits.The driving surface is protected from external damage and provides six sides of contact surface for added torque.Specifications:Quantity: 100 Piece BagMaterial: Stainless SteelFinish PlainColor: SilverThread Size: 5/16″-18Thread Coverage: Fully ThreadedThread Style: Right HandOverall Length: 3/8″Head Style: Socket Cap (Blind Set Screw) (Allen Socket)Point Type: Knurled CupDrive Style: Internal HexDrive Size: 5/32″MFGRP1099