Holds up to 3 times longer than standard drill bits. Drilling through reinforced concrete is a challenging task that demands a lot from drill bits. Standard bits with two cutting edges tend to get stuck in the rebar and break. The solid carbide head on 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 solid carbide head, the Expert SDS plus-7X lasts significantly longer than regular hammer drill bits. It effectively penetrates the rebar, so you don't have to stop, re-aim, or change the bit when you hit steel. Ideal for construction professionals who regularly drill in concrete and reinforced concrete, such as for drilling and installations. The Bosch Expert SDS plus-7X hammer drill bit offers unparalleled performance, reliability, and durability. It is the expert accessory for SDS plus rotary hammers. Compatible with all SDS plus rotary hammers. Diameter (D) mm: 20.00, Working length (L1) mm: 400, Total length (L2) mm: 450.