are they made out of steel or aluminum it says both ?

Mine are made of steel. They tighten down without bending. A nice set of hold down clamps.

Are these M6 size bolts/threads?

They certainly appear to be, since the slots are 8.25mm (0.326") and the threaded screw holes very nearly fill the raised slot-filling boss. It would be easy enough to verify by capturing a vendor photo at 45 degrees and scaling it to normalize the length, then rescaling it by 1.414 to account for the angle. You can then simply measure the hole in the photo directly to get its diameter.

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Genmitsu 4PCS T-Track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer/1018-PRO CNC Router Machine

Genmitsu 4PCS T-Track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer/1018-PRO CNC Router Machine

Product ID: 373776180

Details

Brand
Genmitsu
Colour
Silver
Item Weight
0.2 Kilograms
Item dimensions L x W x H
5 x 2 x 4
Manufacturer
Genmitsu
Material
Zinc

📏Compact 50x20x56mm size

🔩Zinc-Aluminum Alloy durability

⚙️Holds materials up to 30mm thick

C$2993

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Clamp down on precision, elevate your craft!

COMPACT YET POWERFUL DESIGN - Small footprint with maximum clamping force—optimize your workspace without compromise.
UNIVERSAL T TRACK COMPATIBILITY - Versatile hold down clamps perfect for woodworking, metalworking, and more.
ROBUST ZINC ALUMINUM ALLOY BUILD - Durable, wear-resistant clamps designed to withstand heavy use and last.
SECURELY HOLDS UP TO 30 MM MATERIAL - Firm grip ensures your projects stay perfectly positioned during machining.
PRECISION FIT FOR GENMITSU 3018 SERIES - Engineered to seamlessly integrate with your CNC router for flawless stability.

The Genmitsu 4PCS T-Track Mini Hold Down Clamp Kit is a durable, zinc-aluminum alloy clamping solution designed specifically for the Genmitsu 3018 series CNC routers. Compact yet powerful, these clamps securely hold materials up to 30mm thick, ensuring precise and stable workholding. Compatible with universal T-track systems, they are ideal for woodworking, metalworking, and various CNC applications, making them an essential upgrade for any professional or hobbyist aiming for flawless machining results.

Specifications

ASIN	B08H5K2VVK
Brand	Genmitsu
Brand Name	Genmitsu
Colour	Silver
Country of Publication	USA
Customer Reviews	4.5 out of 5 stars 636 Reviews
Included Components	4PCS T-track Mini Hold Down Clamp Kit
Item Dimensions	5 x 2 x 4 Centimeters
Item Type Name	4PCS T-track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer CNC Router Machine
Item Weight	0.2 Kilograms
Item dimensions L x W x H	5 x 2 x 4 Centimeters
Manufacturer	Genmitsu
Manufacturer Part Number	CP50
Material	Zinc
Material Type	Zinc
Model Number	CP50
Number of Items	4
Set Name	4PCS T-track Mini Hold Down Clamp Kit
Style	Woodworking
Style Name	Woodworking
Tensile Strength	300 Pounds Per Square Inch
UPC	816550023853
Unit Count	4 Count

Reviews

K**L

all ok

23.09.2022

S**T

support pour cnc

cela me servir tous le temp merci

5.11.2023

B**D

parfait

tres bien

13.03.2024

T**S

Buenas pinzas para mi CNC

Buenas pinzas para sujetar piezas en mi impresora CNC. Buenas pinzas

16.08.2025

E**5

come da attese

Prodotto come da attese ideake per bloccare un pezzo primavdi lavorarlo con la cnc

26.11.2025

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