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410 Stainless Steel Self-Drilling Screw, Plain Finish, 82 Degree Flat Head, Phillips Drive, #3 Drill Point, 1/4'-14 Thread Size, 1-1/2' Length (Pack of 10): Industrial & Scientific. 410 Stainless Steel Self-Drilling Screw, Plain Finish, 82 Degree Flat Head, Phillips Drive, #3 Drill Point, 1/4"-14 Thread Size, 1-1/2" Length (Pack of 10): Industrial & Scientific. The 10 stainless steel self-drilling screw with plain finish has an 82-degree flat head and a Phillips drive. The 10 stainless steel material offers high strength and hardness ratings, and resists corrosion in mild environments. The material is magnetic. The flat head has an 82-degree cone-shaped bearing surface for use in countersunk holes and a flat top that fits flush with the mated surface. The Phillips drive has an x-shaped slot that accepts a Phillips driver and is designed to allow the driver to slip out of the head to help prevent over-tightening and damage to the thread or fastener.。Self-drilling screws, a type of self-tapping screw, are threaded fasteners that drill their own hole and thread it as they are installed. Usually only recommended for use with metal, self-drilling screws are available with wings that enable use when fastening wood to metal. The drill point length should be long enough to penetrate both materials being fastened before the threading portion reaches the material.。 。 。 。