The Astro Pneumatic Quick Change In-Line 4” Cut-Off Tool, No. 409, has a power rating of 3/4hp and a quick change button on the housing, which locks the motor for easy disc changes. The 4” cut-off tool includes an in-line design for straighter, naturally consistent cuts, according to the company. The tool has an adjustable lever lock safety guard. It works with most 3/8” and 5/8” hole cut-off wheels, and it includes a 4” cut-off wheel.