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By certification 
Drilling Tool
LUHAI provides square Kelly and hexagonal Kelly which is manufactured strictly according to API Spec7-1 and SY/T6509-2000 standard.
Description & Specification
Size: full range from 2-1/2 to 6
Material: AISI 4145H alloy steel
Standard: API SPEC 7-1,SY/T6509-2000.
LUHAI provides square Kelly and hexagonal Kelly which is manufactured strictly according to API Spec7-1 and SY/T6509-2000 standard.
Description & Specification
Size: full range from 2-1/2 to 6
Material: AISI 4145H alloy steel
Standard: API SPEC 7-1,SY/T6509-2000.
