Part number designation
Model code - A (Thread size) x L (Insert length) - OD (Insert diameter) + Material + Finish
L3821-M3x6.0-OD6.0SBZ L3821 Insert,M3x6.0-OD6.0,Steel 1215,Blue zinc plated
L3824-M4x8.0-OD7.0B L3824 Insert with inner hexagon,M4x8.0-OD7.0,Brass C3604