MS-400-3176-PL,  Fits most Infinity microscopes with smaller RMS sized threads.
 
Specifications
100xR Plan Achromat oil immersion objective
N.A. 1.25
Working distance 0.21mm
Provides a flat field of view
Infinity corrected
Corrected for No. 1 ½ coverglass
Spring-loaded bottom lens to prevent damage to the objective and the specimen
RMS threads
Shipping size 9x7x5 inches
Shipping weight 1lb