With H&M’s Quick-Acting Flange Pins welding occurs in minutes with very little fit-up time. Endless threading and un-threading of flange pins are now completely eliminated. The secret is in the knob. Just tilt the knob to bypass the flange pin threads, then straighten the knob to grip the threads for tight, positive clamping. Removal is just as quick and easy. Loosen the knob, tilt and remove. These precise, conical flange pins provide perfect centering on 5/8" to 11/2" bolt holes. Try a set of H&M Quick-Acting Flange Pins and experience why they are a “hole” lot better