... OEM Product Name:Triangle Arrow Type handle (1)Material: Cast Iron,Plastic,Bakelite(2) Type: Bakelite Handwheel,Double Spoked Handwheel ... ,Inner Corrugation Handwheel,Back Corrugation Handwheel,Papilionaceous Type Handwheel ,Foldable Handwheel(3)Surface treatments: Sand blasting, ... , milling, drilling, boring, threading, grinding machines JB/T7274.8-94dDD1Hh11080335321210043042