• They are industrial grade and made of S2 Steel with a Rockwell rating of 60+/- 2. The professional quality S2 steel provides the right combination of strength and durability
• Megapro's Double end bits are 1/4" x 2" (6.35 mm x 50mm) in size. The Spring loaded ball bearing is designed to hold the bit securely in place
• *Tamprproof bits are only to be used in hand driver applications.