Base 20L050 toothed timing pulley with belt guide flanges and over size hub.
See images for measurements.
You bore it to fit your project.
These synchronous pulleys have a wide speed range, are very efficient, do not slip or squeal and much less noise than std v belt drives.
Teeth on the belts are molded to conform with and engage the teeth on a mating L050 toothed belt.
Material aluminum
Belt pitch: LBelt width: 1/2"
20L050 Synchronous Timing Pulley DIY You bore it
$37.00Price
Excluding Sales Tax
One 20L050 Timing Pulley as seen in images.
You will find it costs less to buy a kit versus indavidual parts.