12-Piece Nickel-Plated Brass Cork Borer Set, 4-18mm, German Pattern Safety Supplies_Gloves dropping freely through the ring

dropping freely through the ring when cool but stopped by the ring once flame heating expands the ball

the lightweight beveled body giving safer per-desk Snell's law and lateral-displacement demos

this object screen provides a stable projection surface for ray diagrams and lens investigations in physics coursework

and hinge-distance scales adjustable from 0 to 45 degrees

varying length isolating density as the single variable across materials

12-Piece Nickel-Plated Brass Cork Borer Set, 4-18mm, German Pattern Safety Supplies_Gloves dropping freely through the ringNickel plated brass cork borer set includes 12 German pattern sizes from 4 18mm for creating precise holes in cork and rubber stoppers.