Proto® Open End Wrench, SAE, 5/16 x 3/8 in Wrench Opening, 5-1/4 in Overall Length, 25/32 x 21/32 in Open End Width, 3/16 in Open End Thickness, 15 deg Head, 7/16 x 7/32 in Throat Depth, Flat Handle, Forged Alloy Steel, Black Oxide
- Unique arc design increases surface contact
- Non-reflective black oxide finish for use where non-plated products are required
- Special heat treated alloy steel permits slim shanks for strength and durability
- Standard open end configuration