Rennie Tool Co Ltd. All Options Are For a Box 10 x Premium Quality HSS Cobalt Gold Drill Of The Same Size Apart From The First 6 Options. The 5 piece set includes 4mm 5mm 6mm 8mm & 10mm and. Supplied in plastic case. The 13 Piece set in 0.5mm increments + 3.2mm & 4.8mm and. The 10 Piece Set In 1mm Increments and Supplied In A Plastic Box. The 19 Piece Set In 0.5mm Increments and Supplied In A Metal Box. The 25 Piece Set In 0.5mm Increments. Supplied In A Metal Box. The 51 piece set is in 0.1mm increments and supplied in a metal box. All Orders are despatched from our factory in Manchester, Uk the same day if order before 3pm. For particularly tough or hard metal drilling applications such as stainless steel, Cr-Ni and special acid resistant steels. Fully ground from solid material. M35 alloyed HSS steel with 5% Cobalt content. 135° split point from 3mm and above eradicates the need to pre-drill or centre punch. Prevents walking and enables faster penetration. Sizes available from 1.0mm – 13.0mm.