Heavy-Duty Zinc Alloy Bosshead for Rods up to 16mm Plastic Labware_Plastic Burettes Double-parallel plastic pulley with two

Double-parallel plastic pulley with two 50mm wheels in a steel frame and end hooks

Zinc alloy right-angle boss head with non-toxic powder coating joins rods up to 16mm at 90 degrees

Designed to project wave behavior live for an entire class

AC/DC switchable low-voltage power supply outputting 6V or 12V at 2 amps from a 110V mains input

with polystyrene spheres

Heavy-Duty Zinc Alloy Bosshead for Rods up to 16mm Plastic Labware_Plastic Burettes Double-parallel plastic pulley with twoCast in powder coated zinc alloy at thick gauge for high torsional strength, this heavy duty bosshead holds a support rod and a perpendicular rod in a rigid screw adjustable grip.