Bare Knuckle Performance Seat Screw- Our unique twist on the traditional seat screw, only a little better... rather than losing your seat screw due to only being finger tight, slide a small screwdriver through the slot and give it a little extra torque. 1/4-20 (coarse) thread. Comes complete with o-ring to allow a mar-free installation. Sold each. 100% Made in USA.