[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 sharpening. direction is consistent during grinding, non-slip, smooth and safe to use. [CLAMPING WIDTH RANGE]You 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 RETAINING RING DESIGN] Open retaining ring design ensures that the roller wheel will not deviate during grinding and is always centered. Feature: 1. Metal roller wheel design allows unlimited movement in both directions during the grinding process 2. The direction is consistent during grinding, non-skid, smooth and safe to use. 3. Open retaining ring design that the roller wheel will not deviate during grinding and is always centered. 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 of quality stainless steel.