1. Materials: 45# steel 2. Quality: 42-45 degree hardness,Shankofdrill is Hexagonal Screw 6pcs Spade Drill Bits SetProduct Information:3. Finish : Antirust Oil on surface4. Size Details: 10mm(3/8"), 13mm(1/2"), 16mm(5/8"), 19mm(3/4"), 22mm(7/8"), 25mm(1") PAT7117Pcs/Inner15PCS Pcs/Carton60 pcs Ctn Size43.5*26*38CM G.W./N.W.22/21KGS