AptoGrip is a high quality grip with precision adjustment for standard needles. Reference marks on the tube and a fixed length position of the tip makes it easy to setup with equal length for every setup. The needle protrusion is done by turning the adjustment nut on the grip that is easily accessible while working. AptoGrip wont twist in relation to the machine to prevent unwilling adjustment and gives a solid feeling. B-cycle steam autoclavable @ 134deg C.