Our multipurpose high-quality ten pieces mixed HSS drill bit set is ideal for all metal, alloy, plastic and wood drilling tasks. These drill bits set made from titanium coated high-speed steel are hard and heat resistant. These drill bits are versatile and are designed to drill metal, plastic and wood at great speed. Set comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10mm bits. Suitable for drilling metal using conventional hand and power drills. Begin drilling slowly and never use sideways or apply undue pressure. Lubrication is recommended when drilling metals.