A. - H4 (15/32 - 17/32"). The disposable blade slide along a tapered groove. They are used mostly for repair work in the field. They are generally referenced by a latter which equates to a size range.
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Solid center support of blades for stability. Square driver on shank. HSS blades. Blades have hollow ground cutting edge to reduce friction. Ends are center drilled so blades can be sharpened in place.Sizes: 1/4" - 9/32", 9/32" - 5/16", 5/16" - 11/32", 11/32" - 3/8", 3/8" - 13/32", 13/32" - 7/16", 7/16" - 15/32".
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HV - H16 (8/A - M) (6.35mm - 56.35mm) (1/4"-2 7/32"). Approx Weight of the set: 9Kgs.
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H12 - 1.1/16" - 1.3/16" / 27 - 30.16MM.
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They are generally referenced by a latter which equates to a size range. The Disposable blade slide along a tapered groove. The act of tightening and loosening the restraining nuts at each end varies the size that may be cut.
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eBay