Sealey hss drill bit set 1 10mm 170 pieces sealey dbs170fg this 170 piece hss drill bit set from sealey features fully ground hss drill bits manufactured to din 338 the 135 split point is self centring which helps to reduce thrust friction and heat and aids easier penetration there is also efficient clog free swarf clearance making them suitable for use with both hand and pillar drills particularly on high carbon steels and copper sealey dbs170fg hss drill bit set 1 10mm 170pc