Columbian #6 3/4" Grip-Seal Security Envelopes Columbian White No. 6 3/4 Grip-Seal Security Envelopes 3-5/8 x 6-1/2 500 envelopes Envelopes are ideal for all business, professional and personal correspondence Security tinted for added privacy and confidentiality Columbian White No. 6 3/4 Grip-Seal Security Envelopes 500 envelopes Envelopes are ideal for all business, professional and personal correspondence Security tinted for added privacy and confidentiality