Features: brand new and high quality Made of high-quality stainless steel materials, practical and durable. 4mm/5mm/6mm/7mm/8mm/9mm/10mm, different sizes can also handle different sizes of drill bits, which is very convenient. The drill stop collar is easy to install and very practical, so it is widely used in a variety of scenarios. The drilling work at different heights can be accurately completed, and the situation of excessive penetration of the drill bit can also be avoided. Greatly improve the accuracy, save for time and convenient for operation. Specifications: Material: Stainless Steel Type: 4mm/5mm/6mm/7mm/8mm/9mm/10mm 4mm Size: approx 4x13x16mm/0.16x0.51x0.63 inches 5mm Size: approx 5x13x16mm/0.20x0.51x0.63 inches 6mm Size: approx 6x13x16mm/0.24x0.51x0.63 inches 7mm Size: approx 7x13x20mm/0.28x0.51x0.79 inches 8mm Size: approx 8x13x20mm/0.31x0.51x0.79 inches 9mm Size: approx 9x13x20mm/0.35x0.51x0.79 inches 10mm Size: approx 10x13x20mm/0.39x0.51x0.79 inches Package Includes: 1x Limit Ring note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item.