Perfect Plus Solid Insert (for 4.5, 6.5, 8.5 Quart) by WMF. Fits inside the 4-1/2-quart, 6-1/2-quart, and 8-1/2-quart WMF perfect plus pressure cookers Durable stainless steel construction Add to your existing pressure cooker accessory collection Dishwasher safe Measures 8-3/4-inch