Pentagonal Head Screwdriver Bit Set -10 Size: H 2.15/ 2.85/ 3.15/ 4.05/ 4.35/ 5.15/ 6.35/ 6.75/ 6.95/ 7.55; Overall Length: 50mm/ 2Inch Security Tamper 5Sided Screw Driver Bits Constructed of highly steel with hardened constructions for durability Strong Magnetic Screwdriver Bits: each with strong magnets can accurately screws easy to suck the screws damage to the screw 1/4Inch Pentagonal Bits for standard electrics screwdrivers hand screwdrivers electric drill/driver set & power tool attachments, Manufacturer: Dcaknri