Features: -Easy to process. -Precision, Product lines more clear. -Guider, first enter the barrel; The first layer of blade forms groove; The second layer forms and repairs the groove. Specification: Material:Tungsten Carbide Size: 5.56*5.81mm/ 7.62*7.92mm/ 9.0*9.35mm Package included: 1 x Double Layer Blade Notes: 1.Manual measuring, please allow 1 ~ 3cm error,thank you. 2.The package will be sent out according to your choice, Not three pieces are sold together. Pick a size and we will ship it to you. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture. Dear buyers, we appreciate your business, if you are satisfied with our service, please leave us a positive feedback and rate the details of the transaction (Detailed Seller Ratings) with a "PERFECT 5 STARS". If you have any problems, broken, quality problems, please don't worry, and don't leave bad feedback. Please send us an email first, we will reply you as soon as possible, please allow us to respond within 12 hours. We understand your mood, and will provide you with the best solution for your problem, please give us the opportunity to solve the problem, For any case,please feel free to come to us,we are always here. look forward to and thank you for your trust.