1/4 UNC x 1 A2 ST/ST SLOT FILLISTER HD SCREW SMFNC0250100
1/4 UNC x 1 1/2 A2 ST/ST SLOT FILLISTER HD SCREW SMFNC0250150
1/4 UNC x 3/8 A2 ST/ST SLOT FILLISTER HD SCREW SMFNC0250037
from Kerridge Commercial Systems Ltd