For locating within a slot or hole

PART #                   THREAD        DIA.      HT.     A         B          
R20-502-SLTP           1/4"-20      .50"     2.0"   .25"     .25"    
R20-752-SLTP           1/4"-20      .75"     2.0"   .50"   .375" 

PART #                   THREAD        DIA.      HT.         A       B            
R8-1350-SLTP             M8         13mm   50mm     6mm   6mm   
R8-1950-SLTP             M8         19mm   50mm   12mm 10mm