The 400RT handle is designed to fit standard 45mm rotary blades.

Precision ball bearings reduce friction and minimize hand fatigue. With the 400RT, you won’t need to exert excessive force to glide through multiple layers of fabric. Cutting becomes smoother and more effortless, making your crafting experience truly enjoyable.

• Things to note: with the ball bearings, you can’t “over tighten” the screw like with other handles; please tighten the screw as much as possible to prevent it coming loose with use. Also, you should be pressing the guard button IN before sliding to prevent thumb pain and increase the lifespan of the handle.Cleaning Instructions: When it’s time to change your blade, make sure to sweep or blow away any lint left on the guard, taking care to carefully get any between the guard and the back plastic of the handle. Lint buildup can cause the screw to not be tightened as much as necessary, causing the blade to loosen. When putting your blade back on, make sure that the piece that says “45mm” is on top, with the plain piece on the backside.