Mayhew Tools offers their new line of 1/4" Drive Twist Socket Sets, available as a 16-pc set (No. 66340) that includes sizes 8.25mm to 12mm or 17-pc set that includes sizes 4mm to 8mm. Both sets come in 0.25mm increments, and remove rounded or damaged fasteners with any head configuration (hex, round or square). Tools require no hammering to install socket over fastener, twist socket tightens as more torque is applied. Additional applications include exhaust manifold nuts, studs, pipe nipples and corroded marine fasteners. Manufactured from heat-treated alloy steel. All pieces, including socket rails, are made in the USA.