KPMI® offers precision ground reamers in a variety of popular sizes from 5mm to 3/8”. KPMI® reamers feature long pilots for optimal alignment and are sized to provide ideal valve to guide clearance in many applications. Choose between the practicality of the High Speed Steel Reamers or the ultimate durability of Solid Carbide Reamers. Both reamers styles have been specifically designed for KPMI® Manganese Bronze and Cast Iron valve guides. Do not attempt to use these reamers to size C630 Nickel Aluminum Bronze guides. Also, once a reamer is used on Cast Iron, it is not advisable to then use it on a bronze guide.