Product Introduction 1.This product is Airtact ready, so it requires a compatible GRS engraving system using oil-free compressed air. 2.It is mainly used for jewelry making, crafting, and metal working. 3.The shape is comfortable and compact, which has an adjustable side hose connection. 4.It is suitable for most engraving and stone setting needs including microscopic engraving, deep relief work and bead raising/hammer setting. 5.It is made of high quality material, durable and rustproof.