1. Bi-directional for easy process 2. One holder for both taps and dies 3. Applied for conventional sizes taps and dies 6PCS Bi-directional Ratchet Tap&Die Wrench SetMain Features:1. 4PCS ratchet die collet in following sizes, Φ20, Φ25, Φ30, Φ38 (outside diameter)2.1PC ratchet tap collet for M3-M123.1PC ratchet handlePacking: metal case Bi-directional Ratchet Tap&Die Wrench Set