Specification Brand : Garosa BulletPoint1 : SCREW LOCKING: The drill stop ring is locked with screw, the clamping torsion is up to 4.5kg to prevent the plate from being punctured. BulletPoint2 : EXCELLENT METAL: These stop rings are made of excellent zinc alloy, and wear resistant, and has a long service life. BulletPoint3 : MAIN PURPOSE: These stop rings are suitable for carbon steel bits, which are clamped to limit the drilling depth, convenient and practical. BulletPoint4 : OPEN DESIGN: These drilling depth limit rings are open type design, which can be fine tuned to meet more clamping requirements. BulletPoint5 : SPECIFICATIONS: Including 3pcs metal stop rings, 3 sizes of 6mm, 8mm and 10mm, and equipped with a hex wrench, easy to operate. CuttingAngleString : 82 degrees FinishType : Diamond ItemName : 3PCS Drill Bit Stop Drilling Depth Stop Rings Set with Hex Wrench Open Type ItemPackageDimensions_Height : 8.1 centimeters ItemPackageDimensions_Length : 2.2 centimeters ItemPackageDimensions_Width : 4.8 centimeters ItemTypeKeyword : countersink-bits Manufacturer : Garosa Material : Diamond Material1 : Carbon Steel Material2 : High Speed Steel Material3 : Alloy Steel ModelName : Garosandr8guvaeg ModelNumber : Garosandr8guvaeg NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 5 PartNumber : Garosandr8guvaeg ProductDescription : Specification: Item Type: Drill Bit Stop Ring Material: Zinc Alloy Color: Silver Use: Applicable to carbon steel drill bits, which can be safely locked at any position along the drill bit