SELF-STARTING TYPE; METAL MATERIAL; STEAM OXIDE COATED FINISH; 3/8 INCH MIN. DRILL SIZE; 1/2 INCH MAX. DRILL SIZE; 1/4 INCH SHANK SIZE; 2 SIZE(S); VARI-BIT[R] BRAND; PACKAGING QUANTITY 1 PER PACK; WARRANTY 90 DAYS LIMITED FROM DATE OF PURCHASE