Adjustable Hand Reamers 9 Pcs H4 To H12 15/32 to 1-3/16" Inch6 Blades UK
H12 (I)~> 1.1/16" - 1.3/16" (26.98mm - 30.16mm). The blades are made of carbon steel for long life and can be adjusted by loosening one nut while tightening the other. They are used mostly for repair work in the field.