Attributes . Bits Made of S2 alloy steel for exceptional strength and durability. Intermediate-hardening heat treatment. Urrea offers hand operated bits (for screwdrivers and ratchets) and power operated bits for use on air tools. They feature an optimal quality-to-price ratio thanks to our tempering system and controlled manufacturing processes. Urrea guarantees uniform quality by selecting adequate materials for each one of the following applications. The set includes: 7 Hex bits: 36 mm length: 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm. 7 Hex bits: 80 mm length: 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm. Bit adapter H 1/2? x 10 mm. . Names