With its strong, durable and wear-resistant design, this limit ring offers excellent percompatiblemance and long service life. Its lightweight design makes it easy to store and carry. A stop ring can be used with various drills to easily limit the hole depth during drilling. It is convenient to operate and accurate in drilling, and it is a good helper compatible carpentry. It is constructed of metal material. There are 7 styles compatible you choose from. It is suitable compatible home, woodworking, workshop, and so on. Item Name: Drilling Limit Ring Material: Metal Features: Durable, Sturdy, Easy to Carry, High Hardness Size Details: Style 4, Outer Diameter: 1.6cm/0.63", Thickness: 1.3cm/0.51", Inner Diameter: 0.4cm/0.16"(Approx.) Style 5, Outer Diameter: 1.6cm/0.63", Thickness: 1.3cm/0.51", Inner Diameter: 0.5cm/0.2"(Approx.) Style 6, Outer Diameter: 1.6cm/0.63", Thickness: 1.3cm/0.51", Inner Diameter: 0.6cm/0.24"(Approx.) Style 7, Outer Diameter: 2cm/0.79", Thickness: 1.3cm/0.51", Inner Diameter: 0.7cm/0.28"(Approx.) Style 8, Outer Diameter: 2cm/0.79", Thickness: 1.3cm/0.51", Inner Diameter: 0.8cm/0.31"(Approx.) Style 9, Outer Diameter: 2cm/0.79", Thickness: 1.3cm/0.51", Inner Diameter: 0.9cm/0.35"(Approx.) Style 10, Outer Diameter: 2cm/0.79", Thickness: 1.3cm/0.51", Inner Diameter: 1cm/0.39"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Drilling Limit Ring 1 x Top Screw