3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 sized for breadboarded circuits where

sized for breadboarded circuits where the standard 4mm patch wires would overrun the apparatus footprint

sized for higher-resistance work where milliampere-level currents need to be set without overheating the component

Designed to grip a wide variety of optical components on standard bench rails

supplying a finer-gauge option for precision resistors and standard-cell construction in physics labs

illustrating the primary-battery chemistry behind the Leclanche cell — the historical predecessor of the modern dry battery

3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 sized for breadboarded circuits whereABS plastic pulley with a 50mm ball bearing wheel, a thumbscrew clamp for rod attachment, and an 18mm attachment diameter for pulling small weights in mechanical advantage experiments.