This blade space is made of stainless steel and is designed for multi-blade cutting in MTI SYJ150 low speed saw, and also can be used for South bay or Bumbler low speed and as saw which has 0.5" diameter arbor Specification: Model EQ-LSSO22 Dimension 60 mm O.D 0.5" I.D. Spacer thickness 0.39" ( 10 mm )