What are the dimensions and weight of this fiber optic converter?

The dimensions are 0.80 x 2.20 x 10.20 inches and the weight is 0.22 lb.

What is the maximum data transfer rate of the StarTech.com USB 3.0 to Fiber Optic Converter?

The maximum data transfer rate is up to 1000Mbps.

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StarTech.com USB 3.0 to Fiber Optic Converter - USB to Open SFP Adapter - Gigabit Network Adapter Multi Mode (MMF)/Single Mode Fiber (SMF)

With 1000Base-SX/LX technology get up to 1000Mbps data transfer rate over optical fiber cable
No hassle of internal installation, install externally
Supports optical fiber cable to span longer distances and provides data transmission rates par excellence between networks and different devices
With Optical Fiber cable, get the desired data transfer rate up to a required distance