The fabric folded over twice in a single operation as it is sewn with an overlock stitch to form a 2 mm hem. #68V Roll and Shell Hemmer Foot (2 mm) | BerninaSKU: 008 486 7300£49.50PriceVAT IncludedEnter Make and Model of Machine*0/100Quantity*ADD TO CARTPostage | DeliveryFree postage over £49.00. Under £49.00 - Postage charged at £5.99. Smaller quantities items are sent via Royal Mail. Delivery time 2-4 working days.