A:Answer The pattern is VESA 100 x 100mm, the screw size is M4 x L10. A non-VESA standard screw may damage the product and cause the monitor to fall. LG Electronics is not liable for any accidents relating to the use of non-standard screws. If you are in need of further assistance, please reach out to our support team on Twitter via @LGUSSupport or on Facebook at https://www.facebook.com/LGUSA or call at 800-243-0000. ^Daphane