Round sub base can be used as a guide itself. Supplied with- 10 mm guide bush, 1/4in and 1/2in shank line up pin and bush and fixing screws. Will fit- DEWALT DW620, 621, 624, 625EK, 629, Elu OF97(E), MOF131, 177(E), Bosch GOF1600A 1700ACE and Makita RP0910, 0111C and B & Q CLM2050R, 1250R, 11/03.