Stainless steel bit set, 1/4'', 32 parts. Supplied = assembled. Number of parts = 32 pcs. Product type = bits. Recorded in inches = 1/4 inch. For manual use and electric drills. Suited for use at very low temperatures, extreme resistance to intergranular corrosion and oxidation. Durable. Autoclavable (tools can be heated to over 100 °C to kill germs) Rust free and acid resistant, stainless steel. In a sturdy plastic box.