Holds up to 3 times longer than standard drill bits. Drilling through reinforced concrete is a challenging task that puts a lot of strain on drill bits. Standard drill bits with two cutting edges tend to get stuck in the reinforcement and break. The full carbide head of the Expert SDS plus-7X is an advanced 4-cutter made from a single piece of the hardest metal: it does not jam and shows no weakness when hammer drilling. Thanks to Bosch Carbide Technology and the full carbide head, the Expert SDS plus-7X lasts significantly longer than regular hammer drill bits. It effectively penetrates the reinforcement, so you don't have to stop, re-aim, or change the drill bit when you hit steel. Ideal for construction professionals who regularly drill into concrete and reinforced concrete, such as for drilling and installations. The Bosch Expert SDS plus-7X hammer drill bit offers unmatched performance, reliability, and durability. It is the expert accessory for SDS plus rotary hammers. Compatible with all SDS plus rotary hammers. Diameter (D) mm: 5.50, Working length (L1) mm: 150, Total length (L2) mm: 215.