Simpson 0.390 x 4" Strong-Drive SDHR COMBO-HEAD Screw Blue Zinc PACK:25 Pk This screw uses a T30

This screw uses a T30 6-lobe drive

How many dies are included and what radii are available

Built on a Certified Meehanite casting process with a newly redesigned column and base

Durable Powder Coat Finish: Resists chipping

Simpson 0.390 x 4" Strong-Drive SDHR COMBO-HEAD Screw Blue Zinc PACK:25 Pk This screw uses a T30The Simpson Strong Drive SDHR Combo Head Screw is a heavy duty structural fastener engineered for cross laminated timber construction, mass timber assemblies, and general interior applications. Built with a partially threaded shank and a robust 0. 390 in. outer diameter, this blue zinc coated screw is purpose built to draw structural members tightly together while delivering exceptional connection strength in engineered wood and modular construction