New Precision Aluminum Flexible Shaft Coupler. 12.7MM x 12.7MM (1/2" x 1/2")
Clamp Type with set screws

Outside Dimensions 25mm (OD) x 30mm (Length)

Torque (N.m / Oz/in): Rated 1.5, Max 3 | 212, 424

Max Speed: 6000rpm