10-16 x 2 1/2 Slot Ind HWH 1/4" Across The Flats F/T Self Piercing Scr Needle Point Zinc 1/2 The zinc plating provides additional

The zinc plating provides additional protection against rust and corrosion

It is a lock nut

This 1/4-20 x 7/8 Phillips Truss Machine Screw is made of 18-8 stainless steel

They have a Phillips drive and a truss head

including installing trim

10-16 x 2 1/2 Slot Ind HWH 1/4" Across The Flats F/T Self Piercing Scr Needle Point Zinc 1/2 The zinc plating provides additionalThese 10 16 x 2 1 2 Slot Ind HWH 1 4" Across The Flats F T Self Piercing Scr Needle Point Zinc screws are designed for use in a variety of applications. They are made of zinc plated steel for durability and corrosion resistance. The self piercing point allows for easy penetration of metal, and the slotted head provides a secure hold. These screws are ideal for use in electrical, plumbing, and HVAC applications.