657S Snug with Two 1/4" (6.3 mm) Holes Two 1/4" (6.3mm) diameter holes. Adapts 196, 650, and 651 Series Dial Indicators and 657Y Indicator Attachment to 657X Rod. Snug (Sleeve).
PT18724 Snug Complete – 1/4" and 3/8" Holes
3/8" (9.5mm) diameter post hole. 1/4" (6.3mm) diameter gripping hole accommodates 657X Rod. Snug (Sleeve) Complete (was 196L) Rod.