Product Catalog Model 100, 1" Round Button Machine > Model MTD 100, 1" Mounted Manual System > Model 125, 1-1/4" Round Button Machine > Model MTD 125, 1-1/4" Round Mounted Manual System > Model 150, 1-1/2" Round Button Machine > Model MTD 150, 1-1/2" Round Mounted Manual System > Model MTD 175, 1-3/4" Round Mounted Manual System >