... -allergenic,Durability 4,Manufactory superiority 1. Description: Zinc Alloy Classical Round Knob Bedroom Knob2. Drill holes Distance: Single Hole3. Products Guarantee: ... : Mortice Handle, Pull Handle, Door Handle, Cabinet Handle, Door Knob, Door Stopper, Cothes Hooks and Bathroom accessory Made of ASTM ... American Society for Testing and Materials) Grade. Zinc Alloy Classical Round Knob Bedroom Knob