Dottie SP8112 - #8 x 1-1/2'' Slotted Hex Washer Head Metal Piercing Screws are made of carbon steel with a zinc plated finish. These Sharpeez Screws are ideal for sheet metal, HVAC, plumbing, and electrical applications. Featuring a piercing point and ability to make own mating threads, they have a Rockwell Hardness of HRC 45 min. Sold in a sleeve of 500, with a thread pitch of 15. Head diameter ranges from 0.348'' to 0.322'', and head height from 0.110'' to 0.096''. Drive type is slotted, with a driver size of #2 and hex size of 1/4''.