JEWEL TOOL Pearl & Bead Reamer With Double Helix Design And Wooden Handle: TJ-14876 5.75 inches long overall with a 5/8 inch needle length - standard length Reamer is made of a durable nickel titanium that will cut through beads and pearls with ease Wooden handle hold the double helix designed reamer - best shape for reaming Diameter of 1/2 mm- 7/10 mm of reaming needle - great for precision work Great for making or smoothing out holes in pearls and beads - enlarge holes by sliding the reamer