Mango II Countersinking Type FR Deburring Tool Set (155-90072) by Shaviv®. Use the SHAVIV GENius™ to find the correct deburring tool for your material and application. Features FR ratchet holder, ideal for rotational chamfering, even when workspace is limited. Inside diameter (ID) up to 0.79 (20mm). SHAVIV offers a series of simple-to-use, flexible, yet powerful tools for chamfering and cleaning pipes, tubes and holes. All blades are made of top quality HSS.