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.