Simpson GTS4-5075-R200 1/4" Coarse Threaded Studs w/Fuel Cell, Pkg 200The Simpson Strong Tie GTS is a gas actuated 1 4" threaded stud designed to fasten both permanent and temporary building components to concrete, with the ability to easily remove the attachments. The versatile GTS consists of a 1 2" x 1 4 20 threaded stud and a 3 4" x 0. 127" diameter smooth shank. The GTS is for high volume applications and can be used with common powder actuated tools for fastening into harder substrates (structural steel or extra