The M-CASE Impact Bit & QR Assorted Drill Set (39 pieces) is a versatile and durable set for demanding tasks. Featuring impact-resistant bits, HSS metal drill bits and nutsetters, it is crafted from robust S2, CV, and tool steels for strength and longevity. Ideal for professional use, it offers high performance and precision across various applications. Features and Benefits 24x impact-resistant bits in 25 mm with C 6.3 shank made of robust S2 steel 3x HSS metal drill bits with E 6.3 shank made of high-strength HSS 4241 steel 5x impact-resistant nutsetter with hexagon socket made of robust CV steel 2x stone drill bits with E 6.3 shank made of robust tool steel with inserted carbide plate