Busch #1552 24" x 36" Precision GROUND 0.0005" BENCH Surface PLATE 6" chuck The only difference is that

The only difference is that ES collets have a larger collapse range due to a larger number of slits in the collet body

This is a professional tool and made with all metal construction even the knurled thumb adjustment knob is steel

It has the same specs as BISON and is interchangeable with Bison products

Made in Sweden

Busch #1552 24" x 36" Precision GROUND 0.0005" BENCH Surface PLATE 6" chuck The only difference is thatBusch Ground Bench Plate 24" x 36" x 3" 1552G Adaptable to numerous applications in layout,tooling inspection work and wherever a convenient flat reference surface is required. Sturdy, ribbed construction provides a rigid, durable surface with minimum weight. Precision ground to an overall surface flatness accuracy of . 0005. The packing crate was opened for inspection and photos. The ground surfaces have been protected with packing grease and paper