Durable powder coated finish painted heads that escape notice in finished work #1 square drive, .230 diameter, trim head with "Beaver Bite" type 17 auger point for extra fast starts Coarse threads approximately 2/3 up shank draw board tightly to substrate Pre-drilling always recommended, and a must near board ends to prevent splits Slender #7 shank for finish work and trim Use for decking jobs with stable woods & wood substitutes when screw heads need to be hidden 316 STAINLESS STEEL Lgth In=2-1/4 Color=Ipe