Proto Service Wrench, Alloy Steel, Satin, Head Size 40 mm, Overall Length 7-5/8", 30

These open end service wrenches have a thin handle for use on jam nuts, check nuts, or lock nuts. The opening angle and short length allow access to fasteners in tight spaces. The wrench head can access fasteners from the top and side compared to box wrenches that can only access a fastener from the top. The opposite end allows for a secure grip on the full length of the handle. These single end wrenches are metric size for use on one specific size fastener.