INCLUDES: (1) Three Flute CountersinkFEATURES: 82° High speed steel 3 flute Chatter free performanceSPECIFICATIONS: Size: 1/2" x 82° Shank diameter: 1/4" Recommended for use in portable applications and materials including metal, plastic, and woodChampion's high speed steel three flute countersinks provide chatter free performance in countersinking, deburring, and chamfering operations. Three flute countersinks or "center reamers" seat well in the hole. A good choice for portable applications.