3 guide blocks 1/2″ x 1/2″ x 7/8″ and 1 guide block 1/2″ x 3/8″ x 1-3/4″
Please note the actual dimensions of the Cool Block can be smaller than its nominal dimension by up to 0.05″. For example a 1/2″ Cool Block may measure 0.45″. This is to allow for expansion due to humidity.