High quality pipe threading kit Includes a manual threader with a ratchet system that greatly facilitates work and a direction switch Heads are made of very durable and strong 9cr2 material Rugged construction means it's built to last and ready to stand up to years of heavy use Designed for working professionals Yato YT-2900 Ratchet Die Stock is a high-quality pipe threading kit. The set includes a manual threader with a ratchet system that greatly facilitates work and a direction switch. The kit includes 6 interchangeable heads, sizes 1/4 inch (6.3mm), 3/8 inch (10mm), 1/2 inch (12.5mm), 3/4 inch (19mm), 1 inch (25mm) 5/4 inch (32mm). The heads are made of very durable and strong 9Cr2 material. The set is packed in a plastic suitcase that is convenient to carry and store all elements.