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Name: double external tooth expansion adapter
Specifications: length 53mm (including thread) * diameter 19.80mm
Telescopic length: shortest 41mm, maximum 69 mm (without thread)
Accessories: Black nitrile Seal (backup)*2
Material: high quality brass
Note: There are 16-22mm and 22-31mm , please search the SSJD-16,SSJD-22 models in the store