Holds the screw tight on the tool every time. Button is non-magnetic. Super Smooth rotational action, with no interference ffrom the ProHold Button. Tool strength is not compromised by the ProHold button.

SPECS: Inch- Includes .050, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8. Metric- Includes 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10mm.