Bosch drill bit double ended hss 4 1 x 55mm cylinder shank 10 pcs bosch 2608597589 p these double ended drill bits from bosch have straight shanks and are supplied in a 10 pack p p double ended drill bits 4 1 x 14 x 55 mm pack of 10 p bosch 2608597589 drill bit double ended hss 4 1 x 55mm cylinder shank 10 pcs