Permanent lock vault key envelopes with custom imprint available in sand color. Authorized bank employee places both correctly assigned keys in this permanent-lock vault key control envelope. The customer leasing the safe deposit box must sign the receipt on permanent lock envelope to receive keys. Customer then cuts open key control envelope and uses Snap-Lock key envelope supplied by vault attendant. Size: 3" x 3-1/2". Packed 250 per box. Custom imprint on envelopes runs approximately 3 to 4 weeks.