Commercial Stainless Steel Coffee Tamper Barista Espresso Tamper Coffee Grinder. Coffee Tamper Commercial Espresso Coffee Grinder Mill Machine Stainless Steel. The recommended filter diameter is 57.5mm or 58mm. Food grade stainless steel, more durable and environmentally friendly. There is a non-slip mat at the bottom, which is more intimate. The press reaches 25 kg and the cookware will jump off. 1 Coffee Tamper (not including coffee brewing handle).