Specification: Strength: Identification: Common Use: Comment: Commercial N/A N/A Transparent windows for  CYPRES ®  and VIGIL control units N/A Specification: Strength: Identification: Common Use: Comment: PIA-F-10884 N/A N/A General purpose snap Open when pulled from any  direction. Figure 3-91.  DOT Fasteners, Durable. Figure 3-89.  Vinyl. Figure 3-90.  Fastener tape, hook and pile, nylon (Velcro$^{®}$). Figure 3-92.  DOT Fasteners, Pull-the-dot. ball and shank design. The pins usually are one of two basic  designs: intermediate pin or  terminal pin. The advantage of the  intermediate pin is that it can be visually inspected easily by the  rigger in the field. The end of the 7 × 7 cable can actually be  seen where it is ground off at the bend in the shank of the pin.  Metal ripcord assemblies are used on reserve and emergency  parachute systems and military mains. Main ripcords may also  consist of plastic handles and nylon coated cable without pins. On modern sport parachutes, the hand deploy pilot chute  replaced the conventional ripcord, by either throw- out or pull-out. These configurations use the curved or  straight locking pins attached to the pilot chute bridle.  [Figures 3-93  through  3-101] 3-25 Specification: Strength: Identification: Common Use: Comment: PIA-F-21840 Varies according to use and type Different widths from $^{5}$/$_{8}$" to 3", 1"  most common Closure flaps, bridles, toggles An extremely versatile fastener  material that comes in two types:  high tenacity/low frequency (of use)  and low tenacity/high frequency. Specification: Strength: Identification: Common Use: Comment: PIA-F-10884 N/A Button marked with “pull-the-dot”  markings Military container closure flaps Open only when pulled from one  particular side.