9 piece set for convenience and versatility (including sizes 5/64 IN, 3/32 IN, 7/64 IN, 1/8 IN, 9/64 IN, 5/32 IN, 3/16IN, 7/32 IN, 1/4 IN). One-piece, powder-coated handle/case for corrosion resistance. Laser-etched sizes on case for easy identification. Heat-treated and tempered for extra strength