Senco 39B45MP DuraSpin Drywall to Light Steel Collated Screws 3.9mm x 45mm (1000 in Box) The Senco 39B45MP is a box of 1000 Drywall screws used for fastening interior Drywall to light gauge metal studs. They are 45mm in length with a nominal diameter of 3.9mm. Thread type is fine with a Phillip 2 bugle head. Features: Plastic collated x 50 screws Grey phosphate finish Specification: Article number: 39B45MP Fastener type: Collated Screws Fastener length: 43.8-46.2 mm Collation type: Plastic collated Shank type fastener: Fine Fastener head type: Bugle head Wire material: Phosphate (grey) Point type: Sharp Pointangle (nominal): 23 º Amount fasteners on strip/coil: 50-50 pieces Nominal diameter: 3.90 mm Rotations per minute: 3300, 4000, 5000 RPM Screw diameter: 3.7-4 mm Length of threaded part: 40.00 mm Screw recess type: Philips Screw recess size: 2 Inner threaded diameter: 2.80 mm