Master mechanic, 18 piece, assorted, impact bits set in plastic case, set consists of: 1" philips bit: p1, p2, p3, 2" philips bits power: 2 each p2, p3, 3-1/2" philips bits power: p2, 1" square bits: sq1 sq2, 2" square bits power: 2 each sq2, sq3, 3-1/2" square bits power: sq2, 1" slotted bits: 3/16" & 1/4", 2" torx bits: t15 & t20, shockwave magnetic bit holder case with bulk storage container.