STAINLESS STEEL Made of high quality stainless steel, nut rust, very durable. BRASS ROLLER Brass and stainless steel roller design, allows unrestricted back and forth movement during grinding. direction is consistent during grinding, non-slip, smooth and safe to use. CLAMPING WIDTH RANGEYou can adjust clamping width by rotating the screw-capclamping width range is from 5-82mm(0.2-3.2") ADJUSTABLE BLADE ANGLE The blade angle of this chisel sharpener is adjustable, making it ideal for use by carpenters OPEN RETENTION RING DESIGN Open retaining ring design ensures that roller wheel will not deviate during grinding and is always centered.Feature: 1. Metal roller wheel design allows unrestricted movement in both directions during the grinding process. 2. Direction is consistent during grinding, non-skid, smooth and safe to use. 3. The design of the open retaining ring means that the roller wheel will not move away during grinding and is always centred. 4. The blade angle of this chisel sharpener is adjustable, making it ideal for use by carpenters. 5. Simple tools can be used to sharpen knives and chisels. Made from quality stainless steel.