1) yhickness: ----H-type: 4mm, 6mm, 8/ 10mm ----U-type: 4mm, 6mm, 8/ 10mm ----Snap H 2) used as connection and end-closed during installation Used as connection and end-closed during installation Specifications: 1) Thickness: a) H-type: 4mm, 6mm, 8/ 10mm b) U-type: 4mm, 6mm, 8/ 10mm 2) Snap H