Click the image, which will take you to Massdrop.com. Then, enter PRACTICE in the search box on the Massdrop home page.
ATW-1 - Adjustable Tension Wrench with Rubber Handle Sleeve
This is an adjustable type tension tool with a two prong style. It acts something like the 'wishbone' tension wrench but it is made of heat treated steel wire. A locking fixture slides up the fingers of the wrench which will effectively lock them into place once they've been inserted into a keyway.