Drill Stop Bit Collar Set: 8 stop collar sizes of 1/8 inch 1/4 inch 7/32 inch 1/4 inch 5/16 inch 3/8 inch 7/16 inch 1/2 inch for the common drill sizes to suit your various DIY production work using needs. Suitable for twist drill or brad drills or any type of bit.

Precise and Efficient: Once the stop ring is fixed on the drill, it will not shift. Helps you drill multiple holes quickly and easily to a , precise depth. Solve the problem of your repeated drilling or drilling too . No more wrapping tape around your drill to control depth, save time and achieve greater accuracy.

Durable Material: Made of high carbon steel for good durability. The surface is blackened with anti-rust oil to the anti-rust performance. Safe and sturdy, the screw-type collar will not damage the drill bit.

Easy to Use: Each stop ring has a locking screw allows it to lock securely in any position on the drill bit, and the included hex wrench makes it easy for you to tighten and adjust quickly and easily, accurately control the depth of the hole you are drilling.