Having the right bit for that specialty fastener can make or break your day. This 21-piece Sonic Tools socket bit set is great start to your success. All 21-pieces are 1/2"-drive bits that include Hex, Spline, and Ribe. Sonic socket-bits bases are made from Chrome-Vanadium steel that is excellent for strength and resistance to corrosion, while the business ends of the bits are made from hardened tool steel.