GRK RSS Rugged Structural Screws 10 x 3-1/8" (50 pcs) 
RSS™ Rugged Structural Screws: Ideal for anywhere you would use a traditional lag screw and more. High tensile torque and shear strength means a 5/16” diameter RSS™ screw has the same strength as a 1/2” lag screw.
- Zero Stripping with 6 points of contact
- Enlarges hole to reduce splitting
- Low torque, smoother drive
- Faster penetration
- Size: 10 x 3-1/8"