Punch Hole Strengtheners Register System Pull Tab Register System Registration Pin and Mask Punch Hole Strengtheners Adhesive Stickers . PCB Supplies register system is made from .005" -.005 translucent polyester for flexibility and ease in handling. Punch hole strengtheners for pcb manufacturing to reinforce holes punched in masking materials , to mount register pins to smooth surfaces or to relocate over sized holes to existing pins. Available Sizes: PN 6600 Size Blank PN 6601 Size .125 or 1/8 " PN 6602 Size .187 or 3/16 " PN 6604 Size 5 mm PN 6611 Size 1/8 " x 1/4 " PN 6612 Size 3/16 " x 3/8 " PN 6613 Size 1/4 " x 3/8 " Box of 250 tabs