ITEM NAME:100PCS Stainless Steel Crown Winder Stem Extension Watch Repair Parts 0.9mm Product Description Feature: 100PCS stem extenders/extensions for repairing broken or extending watch crown stems; Perfect for self repairers and watchmakers; Material: Stainless Steel Length(approx.): 11.5mm Rod thin part diameter(approx.): 0.9mm Package Included: 100PCS* Wrist Watch Winding Stem Extensions.100PCS stem extenders/extensions for repairing broken or extending watch crown stems;. 100PCS Wrist Watch Winding Stem Extensions. Material: Stainless Steel. Perfect for self repairers and watchmakers;.