Smith & Wesson, 4 Screws M4 x 4.0mm for 9 mm Target Ch., Mod. 5906 etc.   

Surface:     blued
Size:     Standard
Material:     Steel
Model: 4 Screws M4 x 4.0mm for 9 mm Target Ch., Mod. 5906 etc.

To achieve the optimum wall thicknesses between the screw head, the thickness of the wooden grip and the rounded terminal end of the magazine well, special high quality turned, blued screws are used to screw the grips together