Thumb Screws
length: 20mm (head length 10mm, middle step length 2mm, thread length 8mm)
Head diameter: 15mm
Thread specifications: British 1/4 (1/4-20UNC)
Material: aluminum alloy
This screw aluminum alloy is processed by CNC, exquisitely manufactured, 
light weight, high strength, very practical, suitable for use on telescopes, cameras and other equipment.

Screw inner hexagon
Basic parameters of screws:
Thread type: American/English UNC1/4-20 
(the same type as the screw hole on the tripod and the screw hole of the camera)

Material: 304 stainless steel
There are many thread lengths:
1. Thread length 9.5mm
2. Thread length 12.7mm
3. Thread length 19.0mm
4. Thread length 25.4mm
5. Thread length 31.7mm
Suitable for fixing and camera on astronomical telescope. Fixation of tripod pan/tilt plate and related equipment

Delivery details
---------------------------------------------------------------------

1. We Ship to Worldwide. Please contact with us if didn't find your country.
2. Items will be shipped within 1-10 business days on payment received.
3. Delivery time depends on destination and other factors, it may takes up to 20 business days.

Policy:
---------------------------------------------------------------------

1. We are not responsible for any custom duty or import tax.
2. We will leave positive feedback after receiving the payment.
Please contact us if you are not satisfied with the item after receive it.
3. All messages will be answered within 1 business day.
If you do not receive our reply, please kindly re-sent your message and we will reply to you as soon as possible.
4. Serious Buyer Only! Please place bid only if you agree with all the terms.
5. If you have any problems or concerns whatever with your order or products,
please message us and give us a chance to assist you before you leave any feedback.
We believe we can produce a positive outcome to any situation and will work hard to earn your praise.