screw extractor,square type 1.size No.1-7 2.material: alloy steel or carbon steel 3.black finished or sand blasted

Description:	screw extractor,square type
Specification:	No.1:. M3-6,1/8-1/4
	No.2: M6-8 ,1/4-5/16
	No.3: M8-11,5/16-7/16
	No.4: M11-14,7/16-9/16
	No.5: M14-18,9/16-3/4
	No.6: M18-24,3/4-1"
	No.7: M24-33,1"-1 3/8"
Special requirments:	Heat treatment
	black finished, or sand blasted
Material:	Alloy Steel or Carbon Steel alternative
Hardness:	HRC58-63/HRC42-48
Packing:	bulk or hanging bag