- Length of the material efficiently handle around 40mm- All with fitted 3mm(1/8" shank) diameter mandrels will fit most rotary tools including Dremel- 10 different tools, include: rotary burrs, grinding head and rotary burr cutting tools etc,meet most of your drilling needs,suitable for engraving, beveling, chamfering, grooving, reaming, hollow- This kit is developed mainly for jewelers, lapidary use, hobbies, crafts, craft modeling, home repair, DIYer etc, very effective for small projects- Great For Woodworking and Engraving; Works on Metal, Stone, Wood, Plastic, Fiberglass, and Porcelain. NOT recommended to use them on hardwoodSpecifications:Shank Diameter: 1/8"Shank Length: 0.85"Total Bit Length: 1.6"Type: Rotary Burr SetMaterial: High Speed Steel for DurabilityPackage Included:20 X Carving BurrsNotes:- Due to the difference between different monitors, the picture may not reflect the actual color of the product.- Please leaving a message before you give the bad feedback, if the products have some problems.- Please allow 1-2mm error due to manual measurement.- Thanks for your understanding.