It is a piece of glass, round, diameters are as table below. It is usually for lab experiment use. Thickness is 1mm.
| 16mm round glass piece |
| 17mm round glass piece |
| 18mm round glass piece |
| 19mm round glass piece |
| 20mm round glass piece |
| 21mm round glass piece |
| 22mm round glass piece |
| 23mm round glass piece |
| 24mm round glass piece |
| 25mm round glass piece |
| 26mm round glass piece |
| 27mm round glass piece |
| 28mm round glass piece |
| 29mm round glass piece |
| 30mm round glass piece |
| 31mm round glass piece |
| 32mm round glass piece |
| 33mm round glass piece |
| 34mm round glass piece |
| 35mm round glass piece |
| 36mm round glass piece |
| 37mm round glass piece |
| 38mm round glass piece |
|
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