... , year stamp specificationD4 x 6 , D5 x 8 , D6 x 6 , D8 x 10 , D10 x 10 , D12 x 12 , D16 x 14 , D20 x 14 lnstall method:1 ... quality control 6, Quick delivery time 7, Excellent customer support 8, Made-to-order service available 9, Assured interchangeability 10, Various ...