Thank you for viewing. This is a meticulously crafted, one-of-a-kind groove block for engraving, made with 1mm increments from 13mm to 23mm in diameter. It's a completely original, custom-made item that you won't find anywhere else. ◼️Dimensions Approx. 20mm x 40mm x 150mm ◼️Weight Approx. 800g ◼️Material Steel ◼️Remarks 11 R-shaped sections Diameter error finished to ±0.03mm Edges are carefully chamfered. It will be wrapped in a rust-prevention sheet and carefully packaged for shipping. Although the size is different, the previous buyer was delighted, saying, "It's beautifully finished and I'm very satisfied." Please check the images and consider purchasing. I also have plates for sale, so please take a look. Engraving tool Groove block Original Handmade Accessories Leathercraft Beautiful item Parts... Metal parts Material... Metal Details... Alloy Usage... Metalworking/Engraving