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Blade material: W4Mo3Cr4V1 H.S.S
Handle length: 10'' (255 mm)
Handle material: Domestic ashtree
HRC: 57-63
Package: Wooden box

Contents: 6mm, 12mm, 19mm, 25mm
Blade material: 40Cr/60CrV
Handle material: Ashtree
Blade length: 140+/-5 mm 

Name: 25PCS screw extractor thread repair set
SKU: 138713
Thread Size: 5mm-16mm (3/16"-9/16")
Content:
5PCS-HSS 4241 Polished Drill Bits
5PCS-6150 CrV Polished Extractor Pins
10PCS-45# Steel Drilling Black Oxide Guides
5PCS-Alloy Steel Sandblasting Extractor Nuts

Three jaw gear puller descriptions:
This kind of three jaw gear puller is Ameriacn style.  The material of it is 45#SC by drop forged. As for the surface treatment, you can choose chrome or zinc.