This Ko-ken Starter bundle features some of our most popular products. 3772Z - The 3/8" double universal joint with a pin-less mechanism. 2726ZB-3/8 - A 1/4" body with 3/8" head 72 tooth flexible Z-Series ratchet with Quick Release Function. RS3450M/11 - A full 3/8" NUT GRIP socket set with 11 pieces.