M4 countersunk screws of an undefined length but maybe 10-12mm.
Buy some of these and choose the length you need.
http://www.ebay.co.uk/itm/M3-M4-Metric-A4-Stainless-Steel-Countersunk-Slotted-Head-Machine-Screws-/371149686761?var=&hash=item566a3ec7e9:m:mUbPiXFj4H7wV1bUM2SflqQ
Or probably better with hex here http://www.ebay.co.uk/itm/M4-A2-COUNTERSUNK-CSK-SOCKET-CAP-ALLEN-BOLT-WITH-FREE-NYLOC-NUTS-SCREWS-HEX-/200950009980?var=&hash=item2ec98dd07c:m:mIQYhE5GvzDtB6mRK0y5Y4w
Thanks, ordered some at 10mm, as the current ones seem to be 8mm. I'll let you know how it goes...
@MrDrem started
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M4 countersunk screws of an undefined length but maybe 10-12mm.
Buy some of these and choose the length you need.
http://www.ebay.co.uk/itm/M3-M4-Metric-A4-Stainless-Steel-Countersunk-Slotted-Head-Machine-Screws-/371149686761?var=&hash=item566a3ec7e9:m:mUbPiXFj4H7wV1bUM2SflqQ
Or probably better with hex here http://www.ebay.co.uk/itm/M4-A2-COUNTERSUNK-CSK-SOCKET-CAP-ALLEN-BOLT-WITH-FREE-NYLOC-NUTS-SCREWS-HEX-/200950009980?var=&hash=item2ec98dd07c:m:mIQYhE5GvzDtB6mRK0y5Y4w