Gold & Platinum Monster Starburst 9mm Friction Earring Backs Prop 65 - Lead-Phthalates More torque at all speeds:

More torque at all speeds: Rare-earth permanent-magnet DC design maintains torque under load for confident control

The kit also supplies 2 standard cones

and the assembly can be adjusted up or down with set screws to center the lenses relative to your eyes

The fixture mounts directly to the GRS MicroBlock or GRS MicroBlock XL

this German machinist square is the metalworker's equivalent of a woodworker's try square

Gold & Platinum Monster Starburst 9mm Friction Earring Backs Prop 65 - Lead-Phthalates More torque at all speeds:Monster "Starburst" friction ear nuts are oversized, heavy duty earring backs designed for maximum stability and security. Built to a heavier gauge than standard ear nuts, these 9. 0 mm backs deliver superior grip and support particularly for larger or heavier earrings. Sold individually order two for a pair. Features Large 9. 0 mm diameter at the widest point for maximum support "Starburst" design provides superior grip and holds heavier earrings