Features:
Made of Stainless steel material, durable in use Suit For: High Carbon Steel Drills,and positively locks anywhere along the bit. As Drill Limited ring, clamping device, positioner. Screw type collar will not damage bits. Used for drilling limit, and prevent drilling too deep
Specification:
Size (inside diameter) : 3,4,5,6,7,8,9,9.5,10,12,14,16mm
Material: stainless steel
Weight: 105 g / 3.7 oz(approx.)
Package list:
12 * spacing ring
2 * hex wrench