[Compatible] right angle head grinder attachments is for use with standard 4 1/2 or 5 inch American angle grinders with 5/8-11 threads. No adapters required, just thread directly onto the angle grinder spindle [High Carbon Steel Material] Our angle grinder ball grinding head is made of high carbon steel for excellent wear resistance and are ideal for roughing, moderate shaping, contouring and grinding [Rapid Material Removal] The wood grinder ball gouge consists of hundreds of powerful burrs that quickly remove large quantities of wood while leaving a smooth , it handles wet or dry wood materials and ensures a fine, clean sanding of the wood [Size Information] Ball Head Diameter: 40MM, 25MM. Shank Diameter: 25MM. Cylindrical Head Diameter: 30MM, 20MM. Cylindrical Head Depth: 40MM. Package includes 2pcs Ball Grinding Heads, 2pcs Cylindrical Grinding Heads. Meet your daily use and replacement needs [Multi-Purpose] Our sphere rotary burr can be used for hand wood shaping, hollowing and undercutting wooden workpieces, and roughing out wood. Great for carving wooden bowls, spoons, tree and other wooden artefacts Colour:Black Material:High-carbon steel Package Contents: 4 * Wood Carving tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.