Yamashin Seikyo SM-20A Speed Master

Yamashin Seiki SM-20A Speed Master

I bought this for use with an impact driver, but it turned out to be unnecessary, so I haven't used it. I took the main unit out of the box once, but I never even turned it on, so the product itself is in unused condition.

[Product Description]
Easily reduce the rotation speed of cutting and grinding tools with simple dial operation!
Reduces friction heat of the cutting tool! Extends its life!
With the Speed Master (SM-20A), a high-speed abrasive disc cutter can be converted into a chip saw cutter!
Large capacity 20A, breaker type
Compatible models: High-speed abrasive disc cutters, chip saw cutters, electric circular saws, table saws, sliding compound miter saws, angle grinders, electric drills, sanders, routers, jigsaws, etc.

Voltage: AC100V
Frequency: 50/60Hz
Ambient temperature: 5℃?35℃
No-load speed control: 0?100%
Maximum load current: 15A
Maximum load power: 1,500W
Control method: SCR feedback control
Breaker: 20A
Rated time: 30 minutes
Unit dimensions: W65×H130×D40(mm)
Cord length: 1.7m