Item #70513 DSSB  This snatch block comes in a pack of 4 and is also available in a multi-piece version.
 
The mesurements for the snatch block are as follows:
 
1/24 - 1/25 Scale                                         1/16 Scale
Large 29.17 mm = 12 Ton                            Large 45.58 mm = 12 Ton
Medium 19.98 mm = 8 Ton                         Medium 31.21 mm = 8 Ton
Small 15.85 mm = 4 Ton                              Small 24.76 mm = 4 Ton
 
All mesurements are +/- .25