Specifications:Limit ring is made of 304 stainless steel material, which has good corrosion resistance, heat resistance, sturdiness and durability.Double wire hole has a stronger clamping force and can lock the drill firmly.This limit ring is used to fix the drill bit, limit the depth of the drill bit, and ensure that the depth of the drill bit is consistent.Item Name: Limit Ring KitMaterial: 304 Stainless SteelType:A: 3/4/5/6/8/10mmB: 3/4/5/6/7/8/9/10mmC: 3/4/5/6/7/8/9/9.5/10/12/14/16mmD: 6/8/10mmFeatures: Wear-resistant, Portable, Durable, Easy to UseSize: 7.2cm x 5.2cm x 1.6cm/2.83" x 2.05" x 0.63" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.A Package Includes:1 Set of Limit Rings (Total 6Pcs)1 x Hex WrenchB Package Includes:1 Set of Limit Rings (Total 8Pcs)1 x Hex WrenchC Package Includes:1 Set of Limit Rings (Total 12Pcs)1 x Hex WrenchD Package Includes:1 Set of Limit Rings (Total 3Pcs)1 x Hex Wrench